Determining All Universal Tilers
نویسنده
چکیده
A universal tiler is a convex polyhedron whose every cross-section tiles the plane. In this paper, we introduce a slight-rotating operation for cross-sections of polyhedra. By applying the operation to suitably chosen cross-sections, we prove that a convex polyhedron is a universal tiler if and only if it is a tetrahedron or a pentahedron with parallel facets.
منابع مشابه
Generating Surface Geometry in Higher Dimensions using Local Cell Tilers
In two dimensions contour elements surround two dimensional objects, in three dimensions surfaces surround three dimensional objects and in four dimensions hypersurfaces surround hyperobjects. These surfaces can be represented by a collection of connected simplices, hence, continuous n dimensional surfaces can be represented by a lattice of connected n 1 dimensional simplices. The lattice of co...
متن کاملPythagorean triples, rational angles, and space-filling simplices
The ancient Greeks posed and solved the problem of finding all right triangles with rational sidelengths. There are 4 natural nonEuclidean generalizations of this problem. We solve them all. The result is that the only rational-sided nonEuclidean triangle with one right angle is the isoceles spherical triangle with legs of length 45 and hypotenuse 60. We next ask which simplices have rational d...
متن کاملطرح همگانی یادگیری برای دانشآموزان با نیازهای ویژه
Background: Universal design for learning (UDL) has become a popular instructional approach in special education with the growing awareness of the necessities to providing access to the general curriculum for individuals with special needs. The aim of UDL is to reduce all potential barriers to learning and enhance learning opportunities for students with special needs. Universal design for lear...
متن کاملComparison of methods for the laboratory diagnosis of ocular adenovirus type 3 infection.
A,t present, the laboratory confirmation of clinical adenovirus infection is generally made by either the isolation of virus in tissue culture or the finding of rising antibody tilers. Since it may take as long as two months to isolate an adenovirus and type it, and since the determination of rising titers is also laborious, it was hoped that some other method might be found for the rapid and r...
متن کاملThe Human Language Project: Building a Universal Corpus of the World's Languages
We present a grand challenge to build a corpus that will include all of the world’s languages, in a consistent structure that permits large-scale cross-linguistic processing, enabling the study of universal linguistics. The focal data types, bilingual texts and lexicons, relate each language to one of a set of reference languages. We propose that the ability to train systems to translate into a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Discrete & Computational Geometry
دوره 49 شماره
صفحات -
تاریخ انتشار 2013